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    .caption{
        text-align: center;

    }
    
    .thumbnail{
        max-width: 360px;
        margin: 10px auto;

     

    }
    .jumbotron{
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        color: aliceblue;
        margin-top: -20px;
        text-align: center;
        background: linear-gradient(45deg,#020031,#6d3353);
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    .xh{
        width: 60%;
    text-align: center;
    font-weight: 200;
    display: block;
    margin: 60px auto 40px;

       text-align: center;
        padding-bottom: 19px;
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    .xh h2{
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    }
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                    <h1>Bootstrap</h1>
                    <p>简洁、直观、强悍的前端开发框架，让web开发更迅速、简单。</p>
                    <p><a class="btn btn-primary btn-lg" href="#" role="button">Bootstrap3中文文档(v3.3.7)</a></p>
                   <P><h5>中文文档(v2.3.2)</h5></P> 
                
              
              
                   
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              <div class="xh">
               <h2>Bootstrap相关优质项目推荐</h2>
              
                <p>这些项目或者是对Bootstrap进行了有益的补充，或者是基于Bootstrap开发的</p>


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                                   <p>Bootstrap 优站精选频道收集了众多基于 Bootstrap 构建、设计精美的、有创意的网站。</p>
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